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Q.

Which of the following features are unique to mammals?

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a

Mammary glands, homeothermy, sweat glands

b

Diaphragm, four-chambered heart, viviparity

c

Mammary glands, hair, pinnae

d

Ear ossicles, corpus callosum, dicondylic skull

answer is C.

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Detailed Solution

Mammary glands, sweat glands, sebaceous glands, hair, pinnae, three ear ossicles and corpus callosum are unique to mammals. 

Homeothermy is also found in birds. 

Four-chambered heart is also found in crocodiles and birds. 

Dicondylic skull is also found in amphibians.

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